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// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package httputil
import (
"bytes"
"errors"
"fmt"
"io"
"io/ioutil"
"net"
"net/http"
"strings"
"time"
)
// One of the copies, say from b to r2, could be avoided by using a more
// elaborate trick where the other copy is made during Request/Response.Write.
// This would complicate things too much, given that these functions are for
// debugging only.
func drainBody(b io.ReadCloser) (r1, r2 io.ReadCloser, err error) {
var buf bytes.Buffer
if _, err = buf.ReadFrom(b); err != nil {
return nil, nil, err
}
if err = b.Close(); err != nil {
return nil, nil, err
}
return ioutil.NopCloser(&buf), ioutil.NopCloser(bytes.NewBuffer(buf.Bytes())), nil
}
// dumpConn is a net.Conn which writes to Writer and reads from Reader
type dumpConn struct {
io.Writer
io.Reader
}
func (c *dumpConn) Close() error { return nil }
func (c *dumpConn) LocalAddr() net.Addr { return nil }
func (c *dumpConn) RemoteAddr() net.Addr { return nil }
func (c *dumpConn) SetDeadline(t time.Time) error { return nil }
func (c *dumpConn) SetReadDeadline(t time.Time) error { return nil }
func (c *dumpConn) SetWriteDeadline(t time.Time) error { return nil }
// DumpRequestOut is like DumpRequest but includes
// headers that the standard http.Transport adds,
// such as User-Agent.
func DumpRequestOut(req *http.Request, body bool) (dump []byte, err error) {
save := req.Body
if !body || req.Body == nil {
req.Body = nil
} else {
save, req.Body, err = drainBody(req.Body)
if err != nil {
return
}
}
var b bytes.Buffer
dialed := false
t := &http.Transport{
Dial: func(net, addr string) (c net.Conn, err error) {
if dialed {
return nil, errors.New("unexpected second dial")
}
c = &dumpConn{
Writer: &b,
Reader: strings.NewReader("HTTP/1.1 500 Fake Error\r\n\r\n"),
}
return
},
}
_, err = t.RoundTrip(req)
req.Body = save
if err != nil {
return
}
dump = b.Bytes()
return
}
// Return value if nonempty, def otherwise.
func valueOrDefault(value, def string) string {
if value != "" {
return value
}
return def
}
var reqWriteExcludeHeaderDump = map[string]bool{
"Host": true, // not in Header map anyway
"Content-Length": true,
"Transfer-Encoding": true,
"Trailer": true,
}
// dumpAsReceived writes req to w in the form as it was received, or
// at least as accurately as possible from the information retained in
// the request.
func dumpAsReceived(req *http.Request, w io.Writer) error {
return nil
}
// DumpRequest returns the as-received wire representation of req,
// optionally including the request body, for debugging.
// DumpRequest is semantically a no-op, but in order to
// dump the body, it reads the body data into memory and
// changes req.Body to refer to the in-memory copy.
// The documentation for http.Request.Write details which fields
// of req are used.
func DumpRequest(req *http.Request, body bool) (dump []byte, err error) {
save := req.Body
if !body || req.Body == nil {
req.Body = nil
} else {
save, req.Body, err = drainBody(req.Body)
if err != nil {
return
}
}
var b bytes.Buffer
fmt.Fprintf(&b, "%s %s HTTP/%d.%d\r\n", valueOrDefault(req.Method, "GET"),
req.URL.RequestURI(), req.ProtoMajor, req.ProtoMinor)
host := req.Host
if host == "" && req.URL != nil {
host = req.URL.Host
}
if host != "" {
fmt.Fprintf(&b, "Host: %s\r\n", host)
}
chunked := len(req.TransferEncoding) > 0 && req.TransferEncoding[0] == "chunked"
if len(req.TransferEncoding) > 0 {
fmt.Fprintf(&b, "Transfer-Encoding: %s\r\n", strings.Join(req.TransferEncoding, ","))
}
if req.Close {
fmt.Fprintf(&b, "Connection: close\r\n")
}
err = req.Header.WriteSubset(&b, reqWriteExcludeHeaderDump)
if err != nil {
return
}
io.WriteString(&b, "\r\n")
if req.Body != nil {
var dest io.Writer = &b
if chunked {
dest = NewChunkedWriter(dest)
}
_, err = io.Copy(dest, req.Body)
if chunked {
dest.(io.Closer).Close()
io.WriteString(&b, "\r\n")
}
}
req.Body = save
if err != nil {
return
}
dump = b.Bytes()
return
}
// DumpResponse is like DumpRequest but dumps a response.
func DumpResponse(resp *http.Response, body bool) (dump []byte, err error) {
var b bytes.Buffer
save := resp.Body
savecl := resp.ContentLength
if !body || resp.Body == nil {
resp.Body = nil
resp.ContentLength = 0
} else {
save, resp.Body, err = drainBody(resp.Body)
if err != nil {
return
}
}
err = resp.Write(&b)
resp.Body = save
resp.ContentLength = savecl
if err != nil {
return
}
dump = b.Bytes()
return
}
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